Improvement in sectional steam-boilers



2 Sheets--Sheet i. it D. RENSHAW.

Sectional Steam-Boilers.

No. 134,165. Patented Dec, 24,1872.

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Witnesses; Inventor:

AM PHDTO-LITHOGRAP/f/C [0M1 IOSBIIHNFS P806555 2 Sheets--Sheet 2. D. RENSHAW. Sectional Steam-Boilers.

Patented Dec. 24, 1872.-

by v 7m u m UNITED STATES PATENT QFFIGE.

DAVIDRENSHAlV, OF SYRACUSE, NEW YORK.

I IMPROVEMENT IN SECTIONAL STEAM-BOILERS.

Specification forming part of Letters Patent No. 134,165, dated December 24, 1872; antedated December 1a, 1872.

To all whom it may concern:

Be it known that I, DAVID RENSHAW, of Syracuse, in the county of Onondaga and State of New York, have invented Improvements in Steam-Generators, of which the following is a specification:

Nature and Objectof the Invention.-

This invention relates, in part, to the combination of a reverberatory furnace, the steamdrum placed above said furnace; a series of cross cylinders or pipes placed in the lower part of said furnace; a series of vertical pipes connecting said cross cylinders or pipes with the said steam-drum or steam-chest; and a series of pipes branching out from the said vertical pipes and returning thereto, as hereinafter more fully set forth. Said invention also consists, in part, in the mode of constructing the reverberatory furnace hereinafter described in flat or flattened tubular curved sections, each section being connected with the steam-drum or steam-chest, as hereinafter more fully set forth.

Description of the Accompanying Drawing.

Figure 1 is a vertical transverse section of a furnace adapted to receive the first part of my invention, and a front view of the first part of my invention. Fig. 2 is a longitudinal section of the same furnace and a side view of the other parts. Fig. 3 is .a side view of a sectional furnace and asteam-drum or steam-chest constructed according to the second part of my invention. Fig. 4 is an end view of the same. Fig. 5 is an edge view, or a view from the end of the furnace, of one of the sections which form the furnace. Fig. 6 is a transverse section of the same. 1

General Description.

products of combustion are returned through the lower portion of the sections which form the base A of the furnace, so as to economize as fully as possible the heat arising from the fuel.

(7 is the upper portion of a furnace constructed similarly to the upper part of the furnace described in the Letters Patent granted to me February 20, 1872. Thisform of furnace may be used in connection with the construction of the other parts which I am about to describe; but I have also devised. another construction of this upper part of the furnace, which I regard as superior to it in some respects, and which will be described in a subsequent part of this specification. The lower partof the furnace is provided with two grates, D, with an intermediate hollow section, E, between them, which section is designed to contain water. F F are cross cylinders or pipes which extend through the furnace from side to side, and support the vertical tubes or pipes G G, which latter connect at their upper ends with the steam-drum or steam-chest H, which steam-drum is provided with gage-cocks d d d to regulate the height of the water. I I are pipes which branch out from each side of the pipes G G and return thereto, as shown. These pipes are represented as curved in a semicircular form, that form being best adapted to obtain the best effects of the heat from the reverberatory furnace; but it is obvious that this form may be slightly varied without entirely destroying the advantages to be gained from this construction. The horizontal cylinders F F are joined together by short sections 0 e, substantially as described in my patent of February 20, 1872, before referred to.

' In Figs. 3, 4, 5, and 6 I have represented a construction of the upper part of the furnace which presents several important advantages, and in which the crown or upper part of the furnace is made up of sections, each complete. in itself, and each connected at the bottom with the water-space in the lower portion of the furnace and at the top with the steamdrum H. These sections, marked J J in the drawing, are each cast in a single piece, open at the bottom to connect with the water-space below, but closed at the sides and stay-bolted through the center, as shown in Fig. 6, and also closed at the top, but communicating with the steam-drum H by means of pipes f f so as to discharge the steam therefrom into the steam-drum H. These sections should be bolted at their lower ends to the lower portion A of the furnace, and this lower portion should be cast with bars across its topupon which to bolt the flanges of the said sections, and openings corresponding with the openings in the base of these sections J J. These sections J J are curved, as shown in Figs. 3 and 5, so that when put together in a series, edge to edge, they shall form one-half of a complete arch, the other half being formed by a similar series placed to form the other side of the upper portion of the furnace; and these sections are cast with curved indentations at the top to receive the pipes. G G are the downwardly projecting sections from the steam-drum, with which they connect. These sections J J are strengthened by a row of stay-bolts, g g, which are cast with them, and form a part of the casting of each section. K K and L are three flat sections, united by water-joints, as shown in my patent of February 20,1872, in the same manner as sections J J, and connecting with the lower portion of the furnace in a similar manner. These sections are bolted to a flange cast upon the two front sections of the sides of the upper part of the furnace, and the back of the furnace may be made in a similar manner and secured to the end sections of the sides of the furnace in the same way, and the whole may be secured together by a small number-say four-of long bolts extending from end to end of the furnace and through these flanges. M is a pipe extending from the waterspace in the section L just above the fire-door to the steam-drum for the purpose of equalizing the circulation more perfectly, though, perhaps, this is scarcely indispensable, or possibly not even necessary.

The first part of my invention has the advantage that it adapts the construction described in the Letters Patent granted to me March 12, 1872, to locomotive purposes, the cross cylinders or pipes F F giving stability to the vertical and curved pipes and their attachments, so as to enable them to resist the rocking motion of the engine, which the longitudinal pipes shown in the last-m entioned Letters Patent are not so well adapted to do, while at the same time it preserves all or the principal features of advantage secured by the construction described in the last-mentioned Letters Patent. The second part of my invention has the advantages that, while it forms a perfect arch or reverberatory furnace, it is more simple in its construction, more easily and cheaply constructed and put up, and at the same time is also less liable to injurious derangements than the construction represented in Figs. 1 and 2. It is also stronger.

Claims.

I claim as my invention 1. The combination, with the steam-drum H, vertical pipes G G, pipes I I branching out from the said pipes G G and returning thereto, and a reverberatory furnace, of the crosspipes F F, substantinlly as hereinbefore set forth.

2. The construction of the sides of the upper portions of the reverberatory furnace of a series of flat or flattened sections, J J, curved so as to form an arch when put together as described, and each complete in itself, and connected at or near the top with the steamdrum, and at or near the bottom with the lower water-space, substantially as hereinbefore set forth.

DAVID REFSHAWV.

Witnesses:

Tnos. I. How, ANNA M. NoRTHRoP. 

